Skiing exercise machine



FIG. 1 is a perspective view of a skiing exercise machine in accordancewith the design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof.

The ornamental design for a skiing exercise machine, as shown anddescribed.